What the heck happened last year in that elevator? We may never know, but who could forget that immediately afterward Solange Knowles removed photos of big sister Beyonce from her Instagram accounts. Was it something Bey did? Jay did? The Carter-Knowles clan spoke for everybody on this list when they released a statement, saying, in part, "At the end of the day, families have problems and we're no different." Of course, Beyonce still gets the last word with her "Flawless" remix featuring Nicki Minaj, which includes this added line: "Of course sometimes s**t goes down when there's a billion dollars on an elevator."

2. The Jonas Brothers

The Jo Bros' balancing act suddenly imploded in late 2013 when they suddenly canceled their tour just two days before their first date. A few weeks later, the trio gathered on Good Morning, America to explain why. The short story: the brothers couldn't agree on music, videos, solo opportunities or anything else. In January, Kevin Jonas admitted the "friction" of being in a band together was terrible and said that breaking up saved their family.

Madonna's little brother Christopher once served as her personal assistant and, later, the artistic director of her acclaimed 1993 Girlie Show Tour. Madonna reportedly paid him millions to travel the world with her on tour. How did he repay the Queen of Pop? Does the name Judas ring a bell? Christopher, who's reportedly struggled with drug and alcohol addiction in the past, published the brutal 2008 tell-all memoir Life With My Sister Madonna. The two didn’t speak for many years.

4. Michael & Jermaine Jackson

The Jackson family has seen its share of family feuds, and after Michael died in 2009, things only intensified. But it was bad even back in the 1980s, particularly between Michael and big brother Jermaine. Music mogul Clive Davis, who in the '80s had signed Jermaine to his Arista label, details his version of the feud in his memoir Soundtrack of My Life. Long story short: Davis asserts superstar Michael sabotaged his brother's career.

5. Kyle & Kim Richards

Socialite sisters Kim and Kyle (who are also Paris Hilton's aunts) have been fighting off and on, it seems, for their entire lives. The Real Housewives of Beverly Hills stars have let loose with some truly epic televised screaming matches. What have the fights been about? Kim's kids. Kim's boyfriends. Kim’s sobriety (or lack thereof). Brandi Glanville. You name it.

In the 1990s, the famous Roberts brother and sister were young, beautiful, rich, and, apparently, not speaking for the entire decade. That changed when Julia became a mom in 2004. What was the previous trouble? Not even Eric could put his finger on it, telling The Daily Beast in 2010 that he and little sis simply "both have really strong opinions about things." Also one of them is better known for being an actor than the other, though both claim it as their occupation.